解释句子：(9A Chapter1-8)1. If you work harder, you will pass the exam.= Work harder, or you wont pass the exam.2. We will not finish the work in time unless you give us help.= We cant finish the work in time without your help.3. We found that it was necessary to write down her address.= We found it necessary to write down her address.4. You never forget what you should do.= You never forget what to do.5. You have got an amazing memory.= What an amazing memory you have got!6. We use it to remember phone numbers.= We remember phone numbers with it.7. How much do you weigh?= Whats your weight?= How heavy are you?= Whats the weight of you?8. Some parts of our brains cant grow bigger if we do not use them a lot.= Some parts of our brains cant grow bigger unless we use them a lot.9. If you exercise every day, you will have a strong body. = If you do sports every day, youll be strong.10. What happened when you were shopping yesterday? = What took place when you went shopping yesterday?11. My brother is no longer a naughty boy. = My brother is not a naughty boy any more.12. This mobile phone is now the most popular one. = This mobile phone is now more popular than any other mobile phone.13. To begin with, some basic ideas for a story are necessary.= Firstly / First of all, we need some basic ideas for a story.14. For example, a plot needs to be thought of.= For instance, a plot needs thinking of.15. In the second stage, the type of characters and their voices are decided.= Second, lets decide the type of characters and their voices.16. Fanny is a tall, pleasant girl.= What a tall, pleasant girl Fanny is!17. He always forgets things.= He is forgetful.18. She is frightened of snakes. = She is afraid of snakes.19. What do you think of the animated cartoon? = How do you like the animated cartoon? 20. We have decided how to draw the characters.= We have decided how well draw the characters.21. The students left classroom separately.= The students left the classroom one by one.22. What fun it is to draw comic strips!= Its fun to draw comic strips.23. Land pollution is caused by the deposit of solid waste.= The deposit of solid waste causes land pollution.24. It is vitalthat we do something to save the earth.=It is very importantfor us to do something to save the earth.25. We dont know what to do with the rubbish.= We dont know how to deal with the rubbish.26. The Blacks do not throw away as many cans as the Whites,= The Whites throw away more cans than the Blacks.27. There is no difference between Alices dress and mine.= Alices dress looks the same as mine.28. Mrs. Lin was a kind woman , so everyone respected her. = Mrs. Lin was a kind woman , so everyone had a good opinion of her.29. Fortunately, the fire did not do much damage.= Luckily, the fire did not do much harm.30. These are the basic grammar rules. = These are simple but important grammar rules.31. Humans are polluting the earth.= Humans are making the earth dirty.32. Its vital for us to do something to save earth.= Its important and necessary for us to do something to save earth.33. Without ozone, the sun would burn us up. = If there was no ozone, the sun would burn us up.34. The atmosphere is essential to living things. = The air round earth is very important to living things.35. The glass keeps much of the heat from getting out.= The glass prevents much of the heat from getting out.36. The greenhouse effect may cause the level of the sea to rise = The greenhouse effect may make the level of the sea to rise.37. They are actually video cameras.= In fact, they are video cameras.38. Finally, each frame is photographed separately. = In the end / At last, each frame is photographed separately. 39. When I was walking down the street, I met an old friend of mine. = When walking down the street, I met an old friend of mine.40. She began to play the violin when she was four.= She began to play the violin at the age of four.41. We were surprised when we heard the news. = We were surprised at the news. = We were surprised to hear the news42. She lost her purse when she went to the post office. = She lost her purseon her way to the post office.43. We got plenty of rest so that we could remember the new words better.= We got plenty of rest in order to remember the new words better.44. The maths problem is so difficult that I cannot work it out. = The maths problem is too difficult to work out.45. No living thing can live if there is no air. = No living thing can live without air. 46. He died 2 years ago.= He has been dead for 2 years.47. He suspected that the crown was not completely made of gold.= He didnt believe that the crown was completely made of gold.48. The bath was full of water.= The bath was filled with water.49. We all respect Mr. Wang because of his kindnes